ATTO test, using Kinston 8G micro SDHC Class 4
Using Micro SD adapter--USB adapter- 20M R, 13M W
Photofast MS adapter -- USB adapter - 9.5M R, 9M W
SanDisk 4G MS Pro Duo-- USB adapter - 16M R, 6M W
Transcend Class 6 SDHC --USB adapter - 38M R, 38M W
Photofast adapter has higher write speed thatn SanDisk 4G, but almost 50% decrease in read speed.